Device for hanging and centering grindstones.



' No. 808,570. PATENTBD DEC. 26, 1905.

J. H. NORRELL.

DEVICE FOR HANGING AND CENTERING GRINDSTONES.

APPLICATION FILED MAILQZ, 1905.

W/T/VESSES: mum/ran f JAMES H NORREL L M gay/3&1

ATTORNEYS UNITED STATES P'rnnr FFIGE.

DEVICE FOR HANGING AND CENTEFHNG GRINDSTONES.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed March 22, 1905. Serial No. 251,391.

To atZZ whont it may concern:

Be it known that I, JAMES H. NORRELL, a citizen of the United States, residing at Augusta, in the county of Richmond and State of Georgia, have invented a new and useful I mentioned; and it consists in certain novel features of construction, arrangement, and combination of parts as will be hereinafter fully described, and pointed out in the claims, reference being had to the accompanying drawings, in which Figure 1 is a perspective view showing my improvement applied. Fig. 2 is a central vertical section of a portion of a grindstone with my improvement applied. Fig. 3 is a vertical sectional view showing a modified form of crank. Fig. 4 is a vertical sectional view showing my improvement applied to a grindstone without a central eye.

In carrying out my invention, which is primarily intended for use in connection with grindstones or emery-wheels, I provide the disks 1, which are cast in one piece, with the cranks 2.

3 represents the bearing-grooves, by means of which the cranks are fastened to 'the framework of the ordinary grindstone support 4. Each disk is provided with a central projecting lug or pin 5 on its inner face, the purpose of which will be presently de scribed. Each disk is also provided with two holes 6, extending through the disks diametrically opposite each other a short distance from the center of the disk. The two disks are brought up tightly against the vertical faces of the grindstone and bolts 7, passed through the openings 6 and the eye 8 of the stone and clamped tightly thereagainst by screwing the nuts 9 tightly on the threaded ends of the bolts, or the bolts 7 may be passed through holes 10, drilled through the stone, as shown in Fig. 2. In this construction the eye of the stone is filled with a wooden block 11, driven therein and tightly fitting the eye. Said block has a hole 12 bored through the center, and in the opposite ends of said hole 12 are inserted the lugs or pins 5, thus centering the wheel with respect to its crank-shaft; but, as stated, the

bolts 7 may be passed through the eye of the stone. When this is done, the wood fillingblock 11 may be omitted, as may also the centering-lugs 5.

In Fig. 3 I have shown another form of disk and crank-shaft. In this form the disk and crank-shaft is cast with a central passage or opening extending through the center of each disk and the horizontal portion of the crank. Through this passage a bolt 13 is passed and a nut 14 screwed on the opposite end, tightly clamping the disks a ainst the vertical faces of the grindstone. IlVith this form the bolts 7, before mentioned, may be dispensed with or they may be used in combination with the said bolt 13.

It will be observed that by my improved device a separate shaft for the support of the grindstone is entirely done away with, as the disk and crank on each side of the stone, being integral with each other, obviates the necessity for such a shaft, and hence renders my improvement simpler and much cheaper.

Rotary motion may be given to the grindstone equipped with my improvements through the medium of wires or rods attached to one or both cranks and to treadles, pedals, or other means While my improvement is primarily intended for use in connection with grindstones, it is equally applicable to emerywheels or even pulleys which are to be rotated by means of treadles and pitmen.

Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is

1. The combination with a grindstone, of disks embracing the vertical faces of said stone, crank-shafts integral with said disks, and means for clamping said disks to the said stone.

2. The combination with a grindstone, of disks embracing the vertical faces of said stone, lugs projecting from the center of the inner faces of said disks into the grindstone and centering the same, crank-shafts extending outwardly from said disks, and means for clamping said disks to the stone.

3. The combination with a grindstone, of disks embracing the vertical faces of said stone, integral crank-shafts extending outwardly from said disks, an integral lug extending inwardly from the center of said disk into the grindstone and centering the same, and means for clamping said disks to the stone.

4. The combination with a grindstone hav ing a central opening, disks embracing the projecting inwardly from the center of each Vertical faces of said stone, integral crankdisk into the filling-block to support and censhafts extending outwardly from said disks ter the stone, crank-shafts integral With each and means extending into the central opening disk and extending outwardly therefrom, and

5 of the stone for supporting and centering the means for clamping said disks to the grind- 15 same. stone.

5. The combination With a grindstone hav- JAMES H. NORRELL.

ing a central opening therethrough, a filling- Witnesses:

block fitted in said opening, disks embracing CHAS. W. BOWEN,

[O thevertical faces of said stone, an integrallug GUY M. BOWEN. 

